/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written 
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */ 

package org.apache.jasper.runtime;

import java.io.IOException;
import java.io.FileInputStream;
import java.io.InputStreamReader;

import java.net.URL;
import java.net.MalformedURLException;

import java.util.List;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;

import org.apache.jasper.JasperException;
import org.apache.jasper.Constants;

/**
 * This is the subclass of all JSP-generated servlets.
 *
 * @author Anil K. Vijendran
 */
public abstract class HttpJspBase 
    extends HttpServlet 
    implements HttpJspPage 
{
    protected PageContext pageContext;
    static {
        if( JspFactory.getDefaultFactory() == null ) {
            JspFactoryImpl factory = new JspFactoryImpl();
            if( System.getSecurityManager() != null ) {
                String basePackage = "org.apache.jasper.";
                try {
                    factory.getClass().getClassLoader().loadClass( basePackage +
                                                                   "runtime.JspFactoryImpl$PrivilegedGetPageContext");
                    factory.getClass().getClassLoader().loadClass( basePackage +
                                                                   "runtime.JspFactoryImpl$PrivilegedReleasePageContext");
                    factory.getClass().getClassLoader().loadClass( basePackage +
                                                                   "runtime.JspRuntimeLibrary");
                    factory.getClass().getClassLoader().loadClass( basePackage +
                                                                   "runtime.JspRuntimeLibrary$PrivilegedIntrospectHelper");
                    factory.getClass().getClassLoader().loadClass( basePackage +
                                                                   "runtime.ServletResponseWrapperInclude");
                    factory.getClass().getClassLoader().loadClass( basePackage +
                                                                   "servlet.JspServletWrapper");
                } catch (ClassNotFoundException ex) {
                    System.out.println(
                                       "Jasper JspRuntimeContext preload of class failed: " +
                                       ex.getMessage());
                }
            }
            JspFactory.setDefaultFactory(factory);
        }
    }

    protected HttpJspBase() {
    }

    public final void init(ServletConfig config) 
	throws ServletException 
    {
        super.init(config);
	jspInit();
    }
    
    public String getServletInfo() {
	return Constants.getString ("jsp.engine.info");
    }

    public final void destroy() {
	jspDestroy();
    }

    /**
     * Entry point into service.
     */
    public final void service(HttpServletRequest request, HttpServletResponse response) 
	throws ServletException, IOException 
    {
	_jspService(request, response);
    }
    
    public void jspInit() {
    }
    
    public void jspDestroy() {
    }

    /**
     * Get the list of compile time included files used
     * by the JSP file.
     *
     * Overridden by generated JSP java source files.
     *
     * @return List compile time includes
     */
    public abstract List getIncludes();

    public abstract void _jspService(HttpServletRequest request, 
				     HttpServletResponse response) 
	throws ServletException, IOException;
}
